Add X days to the specified date

Question

Possible Duplicate:
How to add number of days to today’s date?

I would like to add X days , where X is the number I specified earlier, to the certain date.

Eg. the date is the 29/11/2012 (format: DD/MM/YYYY), and I would like to add 5 days to this date so the output should be 03/12/2012.

What have I tried:

var days_to_add = 5;
$myyear = 2012;
$mymonth = 11;
$myday = 29;
date = new Date();
date.setFullYear($myyear,$mymonth,$myday);
date.setDate(date.getDate()+(days_to_add-1));
alert(date.getDate()+'/'+date.getMonth()+'/'+date.getFullYear());

It is working, but only when the date doesnt pass to the next month of a given date, otherwise, the output is good.

Have you guys any solutions for that?

@Diodeus Not really - I would like to add certain amount of days to the `specified` date, while that guy would to the current date. — Scott, Nov 05 '12 at 17:18
@dystroy Yea, thats the main problem; it doesnt. I see the `0` in that case. — Scott, Nov 05 '12 at 17:18

score 3 · Answer 1 · answered Nov 05 '12 at 17:17

3

Something simpler like this ?

 var fiveDaysLater = new Date( existingDate.getTime() );
 fiveDaysLater.setDate(fiveDaysLater.getDate() + 5);

answered Nov 05 '12 at 17:17

topcat3

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And what is the `existingDate` ? – Scott Nov 05 '12 at 17:20
The link from @Diodeus can help with this var dd = someDate.getDate(); var mm = someDate.getMonth() + 1; var y = someDate.getFullYear(); var someFormattedDate = dd + '/'+ mm + '/'+ y; – topcat3 Nov 05 '12 at 17:22
Just change existingDate instead of someDate :) – topcat3 Nov 05 '12 at 17:24

Denys Séguret · Accepted Answer · 2012-11-05T18:04:06.010

1

Your problem isn't in the day addition, as the setDate function increments automatically the year or month if needed :

If the parameter you specify is outside of the expected range, setDate attempts to update the date information in the Date object accordingly

But you're not creating your date correctly. Change

$myyear = 2012;
$mymonth = 11;
$myday = 29;
date = new Date();
date.setFullYear($myyear,$mymonth,$myday);

to

$myyear = 2012;
$mymonth = 11;
$myday = 29;
date = new Date($myyear,$mymonth,$myday);

The Date constructor takes a month in [0, 11]. If you want 11 to be november and not december, use

date = new Date($myyear,$mymonth-1,$myday);

And getMonth returns an integer in [0, 11], which may have surprised you too. You need to output date.getMonth()+1 if you want to have the usual date formating :

alert(date.getDate()+'/'+(date.getMonth()+1)+'/'+date.getFullYear());

If you want to add leading zeros, you could do this :

alert(
     (date.getDate()<10 ? "0" : "") + date.getDate()
     +'/'+
     (date.getMonth()<9 ? "0" : "") + (date.getMonth()+1)
     +'/'+
     date.getFullYear() 
);

Demonstration

Note that if you have many date manipulations to do, you should consider using a library like date.js.

edited Nov 05 '12 at 18:04

answered Nov 05 '12 at 17:22

Denys Séguret

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Not working, see the live demo: http://jsfiddle.net/x36gc/ – Scott Nov 05 '12 at 17:26
It works. Read updated answer. – Denys Séguret Nov 05 '12 at 17:26
Yes, but why it shows `2013` while the specified month is the November ? It should output the `03/12/2012` shouldnt it? – Scott Nov 05 '12 at 17:28
11 isn't november for the Date constructor, it's december... – Denys Séguret Nov 05 '12 at 17:32
Okay. Sorry; its working fine now, but is there a "way" to add leading zeros to the one numbers days or months? – Scott Nov 05 '12 at 17:56
I edited with an answer to this new question. – Denys Séguret Nov 05 '12 at 18:04
if it helps someone, found that very neat solution to add leading 0 when needed : http://stackoverflow.com/questions/3313875/javascript-date-ensure-getminutes-gethours-getseconds-puts-0-in-front-i#answer-3313953 That's for me the best answer so far ! – Mat Jan 17 '14 at 15:28

Add X days to the specified date

2 Answers2